From these decisions, your group is benefiting from specialization.
It is a fixture that you see every day in plumbers' shop windows. Whether Mr Mutt with his own hands made the fountain has no importance. He CHOSE it. He took an ordinary article of life, placed it so that its useful significance disappeared under the new title and point of view – created a new thought for that object.
Throughout its thousand-year history, the term has been applied almost exclusively to the windows of churches, mosques, and other significant buildings.
Stained glass is still made the same way it was back in the Middle Ages and comes in various forms. For the glass used in leaded glass windows, a lump of the molten glass is caught up at one end of a blow pipe, blown into a cylinder, cut, flattened and cooled.